2.Proceedings of the Academy of Natural Sciences of Philadelphia (1864)"The first synonym of Procellaria that I have met with ¡8 hydrobates, Boie, Isis
Von Oken, 1822, p. 562. This has pelagica as its type. This is not, however, ..."

3.The Cambridge Natural History by Sidney Frederick Harmer, Arthur Everett Shipley (1902)"... in Peru at an altitude of 3000 feet; it is a habitual fish-eater, and lives
in streams. Another species, /. hydrobates, was formerly referred to ..."